CN107350442B - Improve the method for slab internal soundness using electromagnetic agitation - Google Patents

Improve the method for slab internal soundness using electromagnetic agitation Download PDF

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Publication number
CN107350442B
CN107350442B CN201710508848.9A CN201710508848A CN107350442B CN 107350442 B CN107350442 B CN 107350442B CN 201710508848 A CN201710508848 A CN 201710508848A CN 107350442 B CN107350442 B CN 107350442B
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Prior art keywords
slab
electromagnetic
steel grade
carbon content
rate
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CN107350442A (en
Inventor
苏笃星
邹长东
张志建
周青峰
胡军
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Zhangjiagang Rongsheng Steel Making Co Ltd
Jiangsu Shagang Iron and Steel Research Institute Co Ltd
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Zhangjiagang Rongsheng Steel Making Co Ltd
Jiangsu Shagang Iron and Steel Research Institute Co Ltd
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    • BPERFORMING OPERATIONS; TRANSPORTING
    • B22CASTING; POWDER METALLURGY
    • B22DCASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D11/00Continuous casting of metals, i.e. casting in indefinite lengths
    • B22D11/10Supplying or treating molten metal
    • B22D11/11Treating the molten metal
    • B22D11/114Treating the molten metal by using agitating or vibrating means
    • B22D11/115Treating the molten metal by using agitating or vibrating means by using magnetic fields
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B22CASTING; POWDER METALLURGY
    • B22DCASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D11/00Continuous casting of metals, i.e. casting in indefinite lengths
    • B22D11/12Accessories for subsequent treating or working cast stock in situ
    • B22D11/122Accessories for subsequent treating or working cast stock in situ using magnetic fields

Abstract

This application discloses a kind of methods for improving slab internal soundness using electromagnetic agitation, the electromagnetic stirring roller is installed on the position that the non-solidification rate of secondary cooling zone slab is 25%~40%, for the carbon content and slab thickness of different steel grades, using suitable Water Rate for Secondary Cooling Water and stirring parameter, to improve the utilization effect of electromagnetic agitating technology, installation site, use condition and the mixing parametric setting for reasonably selecting electromagnetic mixing apparatus for slab secondary cooling zone provide reference.

Description

Improve the method for slab internal soundness using electromagnetic agitation
Technical field
The application belongs to continuous casting technology field, in particular to a kind of side for improving slab internal soundness using electromagnetic agitation Method.
Background technique
The competition of steel industry is more and more fierce, and the variety steel product proportion of Wide and Thick Slab steps up in recent years, downstream work Ordered pair slab quality proposes more stringent requirement.Due to being influenced by slab compression ratio, internal soundness includes being segregated, being loose It is difficult to eliminate with shrinkage cavity etc., has seriously affected slab internal soundness, plate flaw detection qualification rate is difficult to ensure.
Secondary cooling area for continuous casting electromagnetic agitating technology is not solidify molten steel in slab using by the effect of electromagnetic force to strengthen Movement, thus flowing, heat transfer and migration during changing molten steel solidification, and then expand isometric crystalline region, component segregation is reduced, is subtracted Light or elimination center porosity and central pipe achieve the purpose that improve Inner Quality of Billet.Currently, China's electromagnetic agitation is online Using having biggish progress and development, but since electromagnetic agitation is a new technology, technique is not easy to grasp, domestic application Research is also insufficient, therefore also unsatisfactory with effect, and the reasons are as follows: engineer testing is insufficient, not to technique Parameter is sufficiently optimized;Steel grade is improper, effect of the electromagnetic agitation to the special steel grade such as silicon steel, high-carbon steel, stainless steel, slab Obvious, then effect is limited for ordinary steel;The casting parameters such as stirring parameter and pulling rate mismatch, it is made to fail to play Due effect.Usual secondary cooling zone electromagnetic mixing apparatus is installed on a fixed position, i.e. electromagnetic mixing apparatus can not be with work The change of skill condition and correspondingly change installation site, need to find one according to main casting steel grade, section and pulling rate situation Optimal installation site.
Summary of the invention
The purpose of the present invention is to provide a kind of methods for improving slab internal soundness using electromagnetic agitation, to improve electromagnetism The utilization effect of stirring technique mentions to reasonably select installation site, use condition and the mixing parametric setting of electromagnetic mixing apparatus For reference.
To achieve the above object, the invention provides the following technical scheme:
The embodiment of the present application discloses a kind of method for improving slab internal soundness using electromagnetic agitation, the electromagnetic agitation Roller is installed on the position that the non-solidification rate of secondary cooling zone slab is 25%~40%, steel grade carbon content, slab thickness and Water Rate for Secondary Cooling Water Corresponding relationship it is as follows:
Steel grade carbon content≤0.35%, slab thickness 220mm, Water Rate for Secondary Cooling Water 0.70L/Kg~0.80L/Kg;
Steel grade carbon content > 0.35%, slab thickness 220mm, Water Rate for Secondary Cooling Water 0.85L/Kg~0.95L/Kg;
Steel grade carbon content≤0.35%, slab thickness 320mm, Water Rate for Secondary Cooling Water 0.40L/Kg~0.50L/Kg;
Steel grade carbon content > 0.35%, slab thickness 320mm, Water Rate for Secondary Cooling Water 0.60L/Kg~0.70L/Kg,
The corresponding relationship of steel grade carbon content, slab thickness and stirring parameter is as follows:
Steel grade carbon content≤0.35%, slab thickness 320mm, stirring parameter: 420~480A of electric current, frequency 6Hz;
Steel grade carbon content > 0.35%, slab thickness 320mm, stirring parameter: 520~550A of electric current, frequency 6Hz;
Slab thickness 220mm, stirring parameter: 380~400A of electric current, 3~6Hz of frequency.
Preferably, in the above-mentioned method for improving slab internal soundness using electromagnetic agitation, the electromagnetic stirring roller is every Two are respectively arranged in adjacent sectors outlet and entrance position as a pair of, opposed installation, using two pairs of electromagnetic stirring rollers It sets.
It is furthermore preferred that in the above-mentioned method for improving slab internal soundness using electromagnetic agitation, adjacent two pairs of electricity Magnetic agitating roller operating status is synchronous, and preceding is main cabinet to electromagnetic stirring roller, after be from cabinet to electromagnetic stirring roller.
It is furthermore preferred that two pairs of electromagnetism stir in the above-mentioned method for improving slab internal soundness using electromagnetic agitation Mix that roller magnetic fields direction is identical, the stirring parameter is identical.
It is furthermore preferred that two pairs of electromagnetism stir in the above-mentioned method for improving slab internal soundness using electromagnetic agitation It mixes roller and is all made of the action mode continuously stirred.
The method provided by the invention for improving slab internal soundness using electromagnetic agitation, provides the best of electromagnetic stirring roller Installation site meets same conticaster and produces different steel grades by Proper Match stirring parameter and casting parameters The best electromagnetic agitation effect of casting blank section, high-carbon steel, the control of alloy die steel center segregation of casting blank are within C1.5 grades, without in Between crackle and triangular area crack defect, stocking flaw detection qualification rate effectively improves slab internal soundness up to 99% or more.
Specific embodiment
Below by a detailed description of the technical solution in the embodiment of the present invention is provided, it is clear that described embodiment is only It is only a part of the embodiment of the present invention, instead of all the embodiments.Based on the embodiments of the present invention, ordinary skill Personnel's every other embodiment obtained without making creative work belongs to the model that the present invention protects It encloses.
Improve the method for slab internal soundness using electromagnetic agitation, electromagnetic stirring roller is installed on the non-solidification rate of secondary cooling zone slab For 25%~40% position.
Further, electromagnetic stirring roller every two are used as a pair, and opposed installation is installed respectively using two pairs of electromagnetic stirring rollers In adjacent sectors outlet and entry position.
Further, adjacent two pairs of electromagnetic stirring roller operating statuses are synchronous, and preceding is main cabinet to electromagnetic stirring roller, after to electromagnetism Agitating roller is from cabinet.
Further, two pairs of electromagnetic stirring roller magnetic fields directions are identical, stirring parameter is identical.
Further, two pairs of electromagnetic stirring rollers are all made of the action mode continuously stirred.
Embodiment 1
The chemical component of steel grade are as follows: [C]: 0.15%, [Si]: 0.20%, [Mn]: 1.00%, [P]: 0.02%, [S]: 0.004%, [Al]: 0.03%, [Nb]: 0.02%, [Ti]: 0.02%, [N]: 0.0045%, surplus Fe.Production process according to Secondary includes molten iron pretreatment, converter smelting, external refining, sheet billet continuous casting, produces a 8 furnace steel of tundish, slab section ruler altogether It is very little are as follows: 2065 × 220mm2, pulling rate 1.10m/min, Water Rate for Secondary Cooling Water 0.70L/Kg, secondary cooling zone two is to stirring parameter It is 400A, 6Hz.The continuous casting billet center segregation of this tundish production is within C1.0 grades, equiaxial crystal ratio 30%, and flaw detection is qualified Rate is 100%.
Embodiment 2
The chemical component of steel grade are as follows: [C]: 0.35%, [Si]: 0.19%, [Mn]: 0.96%, [P]: 0.018%, [S]: 0.003%, [Al]: 0.027%, [Nb]: 0.018%, [Ti]: 0.019%, [N]: 0.0042%, surplus Fe.Production process Successively include molten iron pretreatment, converter smelting, external refining, sheet billet continuous casting, produces a 12 furnace steel of tundish, slab section altogether Size are as follows: 2065 × 220mm2, pulling rate 1.10m/min, Water Rate for Secondary Cooling Water 0.80L/Kg, secondary cooling zone two is to electromagnetic agitation ginseng Number is 380A, 3Hz.The continuous casting billet center segregation of this tundish production within C1.0 grades, close by equiaxial crystal ratio 25%, flaw detection Lattice rate is 99.9%.
Embodiment 3
The chemical component of steel grade are as follows: [C]: 0.40%, [Si]: 0.19%, [Mn]: 1.02%, [P]: 0.03%, [S]: 0.003%, [Al]: 0.028%, [Nb]: 0.021%, [Ti]: 0.022%, [N]: 0.0044%, surplus Fe.Production process Successively include molten iron pretreatment, converter smelting, external refining, sheet billet continuous casting, produces a 15 furnace steel of tundish, slab section altogether Size are as follows: 2065 × 220mm2, pulling rate 1.10m/min, Water Rate for Secondary Cooling Water 0.85L/Kg, secondary cooling zone two is to electromagnetic agitation ginseng Number is 400A, 6Hz.The continuous casting billet center segregation of this tundish production within C1.0 grades, close by equiaxial crystal ratio 35%, flaw detection Lattice rate is 99.95%.
Embodiment 4
The chemical component of steel grade are as follows: [C]: 0.42%, [Si]: 0.18%, [Mn]: 1.04%, [P]: 0.022%, [S]: 0.005%, [Al]: 0.04%, [Nb]: 0.028%, [Ti]: 0.021%, [N]: 0.0045%, surplus Fe.Production process Successively include molten iron pretreatment, converter smelting, external refining, sheet billet continuous casting, produces a 14 furnace steel of tundish, slab section altogether Size are as follows: 2065 × 220mm2, pulling rate 1.10m/min, Water Rate for Secondary Cooling Water 0.95L/Kg, secondary cooling zone two is to electromagnetic agitation ginseng Number is 380A, 3Hz.The continuous casting billet center segregation of this tundish production within C1.0 grades, close by equiaxial crystal ratio 40%, flaw detection Lattice rate is 99.93%.
Embodiment 5
The chemical component of steel grade are as follows: [C]: 0.20%, [Si]: 0.18%, [Mn]: 0.69%, [P]: 0.014%, [S]: 0.004%, [Al]: 0.02%, [Ti]: 0.02%, [N]: 0.0065%, surplus Fe.Production process successively includes that molten iron is pre- Processing, converter smelting, external refining, sheet billet continuous casting produce a 15 furnace steel of tundish, slab cross dimensions altogether are as follows: 2265 × 320mm2, pulling rate 0.65m/min, Water Rate for Secondary Cooling Water 0.40L/Kg, secondary cooling zone two to stirring parameter be 420A, 6Hz.The continuous casting billet center segregation of this tundish production is within C1.0 grades, equiaxial crystal ratio 46%, and flaw detection qualification rate is 99.53%.
Embodiment 6
The chemical component of steel grade are as follows: [C]: 0.35%, [Si]: 0.19%, [Mn]: 0.68%, [P]: 0.016%, [S]: 0.005%, [Al]: 0.022%, [Ti]: 0.022%, [N]: 0.006%, surplus Fe.Production process successively includes that molten iron is pre- Processing, converter smelting, external refining, sheet billet continuous casting produce a 13 furnace steel of tundish, slab cross dimensions altogether are as follows: 2265 × 320mm2, pulling rate 0.65m/min, Water Rate for Secondary Cooling Water 0.50L/Kg, secondary cooling zone two to stirring parameter be 480A, 6Hz.The continuous casting billet center segregation of this tundish production is within C1.0 grades, equiaxial crystal ratio 40%, and flaw detection qualification rate is 99.62%.
Embodiment 7
The chemical component of steel grade are as follows: [C]: 0.38%, [Si]: 0.19%, [Mn]: 0.72%, [P]: 0.015%, [S]: 0.004%, [Al]: 0.03%, [Ti]: 0.022%, [N]: 0.0063%, surplus Fe.Production process successively includes that molten iron is pre- Processing, converter smelting, external refining, sheet billet continuous casting produce a 10 furnace steel of tundish, slab cross dimensions altogether are as follows: 2265 × 320mm2, pulling rate 0.65m/min, Water Rate for Secondary Cooling Water 0.60L/Kg, secondary cooling zone two to stirring parameter be 520A, 6Hz.The continuous casting billet center segregation of this tundish production is within C1.0 grades, equiaxial crystal ratio 41%, and flaw detection qualification rate is 99.55%.
Embodiment 8
The chemical component of steel grade are as follows: [C]: 0.41%, [Si]: 0.21%, [Mn]: 0.70%, [P]: 0.016%, [S]: 0.006%, [Al]: 0.022%, [Ti]: 0.022%, [N]: 0.0062%, surplus Fe.Production process successively includes molten iron Pretreatment, converter smelting, external refining, sheet billet continuous casting produce a 18 furnace steel of tundish, slab cross dimensions are as follows: 2265 altogether ×320mm2, pulling rate 0.65m/min, Water Rate for Secondary Cooling Water 0.70L/Kg, secondary cooling zone two to stirring parameter be 550A, 6Hz.The continuous casting billet center segregation of this tundish production is within C1.0 grades, equiaxial crystal ratio 38%, and flaw detection qualification rate is 99.71%.
Comparative example 1
The chemical component of steel grade are as follows: [C]: 0.15%, [Si]: 0.20%, [Mn]: 1.00%, [P]: 0.015%, [S]: 0.004%, [Al]: 0.04%, [Nb]: 0.03%, [Ti]: 0.01%, [N]: 0.0045%, surplus Fe.Production process according to Secondary includes molten iron pretreatment, converter smelting, external refining, sheet billet continuous casting, produces a 19 furnace steel of tundish, slab section ruler altogether It is very little are as follows: 2065 × 220mm2, pulling rate 1.10m/min, Water Rate for Secondary Cooling Water 0.81L/Kg do not use secondary cooling zone electromagnetic agitation. The continuous casting billet center segregation of this tundish production is at B1.0 grades, and equiaxial crystal ratio is only 5%, flaw detection qualification rate 97.70%.
Comparative example 2
The chemical component of S45C steel grade are as follows: [C]: 0.45%, [Si]: 0.20%, [Mn]: 0.70%, [P]: 0.015%, [S]: 0.005%, [Al]: 0.03%, [Ti]: 0.01%, [N]: 0.0060%, surplus Fe.Production process successively includes iron Water pretreatment, converter smelting, external refining, sheet billet continuous casting produce a 13 furnace steel of tundish, slab cross dimensions altogether are as follows: 2265×320mm2, pulling rate 0.65m/min, Water Rate for Secondary Cooling Water 0.60L/Kg do not use secondary cooling zone electromagnetic agitation.Among this The continuous casting billet center segregation of production is wrapped at B1.0 grades, equiaxial crystal ratio 9%, flaw detection qualification rate 96.32%.
This embodiment is just an exemplary description of this patent and does not limit its protection scope, and those skilled in the art are also Local change can be carried out to it, as long as it does not exceed the essence of this patent, all be considered as the equivalent replacement to this patent, all Within the protection scope of this patent.

Claims (4)

1. a kind of method for improving slab internal soundness using electromagnetic agitation, which is characterized in that it is cold that electromagnetic stirring roller is installed on two The position that slab non-solidification rate in area's is 25%~40%, the corresponding relationship of steel grade carbon content, slab thickness and Water Rate for Secondary Cooling Water is such as Under:
Steel grade carbon content≤0.35%, slab thickness 220mm, Water Rate for Secondary Cooling Water 0.70L/Kg~0.80L/Kg;
Steel grade carbon content > 0.35%, slab thickness 220mm, Water Rate for Secondary Cooling Water 0.85L/Kg~0.95L/Kg;
Steel grade carbon content≤0.35%, slab thickness 320mm, Water Rate for Secondary Cooling Water 0.40L/Kg~0.50L/Kg;
Steel grade carbon content > 0.35%, slab thickness 320mm, Water Rate for Secondary Cooling Water 0.60L/Kg~0.70L/Kg,
The corresponding relationship of steel grade carbon content, slab thickness and stirring parameter is as follows:
Steel grade carbon content≤0.35%, slab thickness 320mm, stirring parameter: 420~480A of electric current, frequency 6Hz;
Steel grade carbon content > 0.35%, slab thickness 320mm, stirring parameter: 520~550A of electric current, frequency 6Hz;
Slab thickness 220mm, stirring parameter: 380~400A of electric current, 3~6Hz of frequency.
2. the method according to claim 1 for improving slab internal soundness using electromagnetic agitation, which is characterized in that the electricity Magnetic agitating roller every two are used as a pair, and opposed installation is respectively arranged in adjacent sectors using two pairs of electromagnetic stirring rollers and goes out Mouth and entry position.
3. the method according to claim 2 for improving slab internal soundness using electromagnetic agitation, which is characterized in that two pairs of institutes State that electromagnetic stirring roller magnetic fields direction is identical, the stirring parameter is identical.
4. the method according to claim 2 for improving slab internal soundness using electromagnetic agitation, which is characterized in that two pairs of institutes It states electromagnetic stirring roller and is all made of the action mode continuously stirred.
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Publication number Priority date Publication date Assignee Title
CN109079114B (en) * 2018-08-27 2021-01-26 南京钢铁股份有限公司 Method for producing wear-resistant steel by adopting electromagnetic stirring in slab secondary cooling zone
CN109940140A (en) * 2019-05-05 2019-06-28 马鞍山钢铁股份有限公司 A method of improving hypo-peritectic steel center segregation of casting blank quality
CN111266543A (en) * 2020-03-13 2020-06-12 南京钢铁股份有限公司 Electromagnetic stirring method for high-carbon steel secondary cooling area

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US3905417A (en) * 1972-12-21 1975-09-16 Cem Comp Electro Mec Electromagnetic rabbling mechanism for continuously pouring molten metal
US4030534A (en) * 1973-04-18 1977-06-21 Nippon Steel Corporation Apparatus for continuous casting using linear magnetic field for core agitation
US3981345A (en) * 1973-05-21 1976-09-21 Institut De Recherches De La Siderurgie Francaise (Irsid) Method to improve the structure of cast metal during continuous casting thereof
US4106546A (en) * 1974-02-27 1978-08-15 Asea Aktiebolag Method for inductively stirring molten steel in a continuously cast steel strand
JPS58128253A (en) * 1982-01-27 1983-07-30 Nippon Steel Corp Method for stirring molten metal which decreases inclusion of continuous casting ingot
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